CN111562247A - Hydrogen sulfide and carbon dioxide on-line analysis device and method - Google Patents
Hydrogen sulfide and carbon dioxide on-line analysis device and method Download PDFInfo
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- CN111562247A CN111562247A CN201910116099.4A CN201910116099A CN111562247A CN 111562247 A CN111562247 A CN 111562247A CN 201910116099 A CN201910116099 A CN 201910116099A CN 111562247 A CN111562247 A CN 111562247A
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Abstract
The invention discloses a device and a method for analyzing hydrogen sulfide and carbon dioxide on line, and belongs to the technical field of natural gas analysis. The method comprises the following steps: gas-liquid separation, filtration and pressure stabilization are respectively carried out on the target natural gas raw material gas by adopting a gas-liquid separator, a filter and a pressure stabilizer; obtaining a first relational expression between the concentration of the hydrogen sulfide and the characteristic Raman peak height or area of the hydrogen sulfide; acquiring a second relational expression among the concentration of the carbon dioxide, the characteristic Raman peak height or area of the carbon dioxide and the interference peak height or area of the n-butane; and detecting the actual Raman spectrum of the hydrogen sulfide, the actual Raman spectrum of the carbon dioxide and the actual Raman spectrum of n-butane in the target natural gas feed gas by using a laser Raman analyzer, and determining the concentrations of the hydrogen sulfide and the carbon dioxide in the target natural gas feed gas according to the first relational expression and the second relational expression, so that the requirement of timely adjusting the desulfurization carbon process of the purification plant is met.
Description
Technical Field
The invention relates to the technical field of natural gas analysis, in particular to a device and a method for analyzing hydrogen sulfide and carbon dioxide on line.
Background
With the revision of GB-17820 natural gas, the content index of hydrogen sulfide in the natural gas is changed from 20mg/m3To 6mg/m3And the method has higher requirements on the purification process of the natural gas raw material gas and the gas quality analysis of the natural gas raw material gas. Because the natural gas raw material gas comes from different gas wells, the gas quality is unstable, and the content of hydrogen sulfide is 90g/m3-120g/m3The carbon dioxide content fluctuates between 50 and 100g/m3To fluctuate. Therefore, the desulfurization carbon process of the purification plant needs to be adjusted in time so that the content of hydrogen sulfide and carbon dioxide in the natural gas feed gas meets the requirement. Based on the above, it is necessary to provide a method capable of detecting the content of hydrogen sulfide and carbon dioxide in the natural gas raw material gas on line.
At present, the content of hydrogen sulfide in natural gas feed gas is detected on line through a laser hydrogen sulfide analyzer, and the demand of timely adjustment of a desulfurization carbon process of a purification plant cannot be met.
Disclosure of Invention
The embodiment of the invention provides a device and a method for analyzing hydrogen sulfide and carbon dioxide on line, which can solve the technical problems. The specific technical scheme is as follows:
in one aspect, an embodiment of the present invention provides an online analysis method for hydrogen sulfide and carbon dioxide, where the method includes:
outputting the target natural gas raw material gas by using a natural gas raw material gas output member;
carrying out gas-liquid separation treatment on the target natural gas raw material gas by adopting a gas-liquid separator;
filtering the target natural gas raw material gas subjected to the gas-liquid separation treatment by using a filter;
performing pressure stabilization treatment on the filtered target natural gas feed gas by using a pressure stabilizer;
obtaining a first relational expression between the concentration of the hydrogen sulfide and the characteristic Raman peak height or area of the hydrogen sulfide;
acquiring a second relational expression among the concentration of the carbon dioxide, the characteristic Raman peak height or area of the carbon dioxide and the interference peak height or area of the n-butane;
detecting the actual Raman spectrum of hydrogen sulfide, the actual Raman spectrum of carbon dioxide and the actual Raman spectrum of n-butane in the target natural gas feed gas after the pressure stabilization treatment by using a laser Raman analyzer;
determining the concentration of the hydrogen sulfide in the target natural gas feed gas according to the first relation and the actual Raman spectrum of the hydrogen sulfide;
and determining the concentration of the carbon dioxide in the target natural gas feed gas according to the second relation, the actual Raman spectrum of the carbon dioxide and the actual Raman spectrum of the n-butane.
In one possible design, the obtaining a first relationship between the concentration of hydrogen sulfide and a characteristic raman peak height or area of hydrogen sulfide includes:
obtaining a plurality of hydrogen sulfide standard substances with different hydrogen sulfide concentrations;
respectively detecting the standard Raman spectra of the hydrogen sulfide in the plurality of hydrogen sulfide standard substances by using the laser Raman analyzer;
determining the characteristic Raman peak heights or areas corresponding to hydrogen sulfide with different concentrations according to the standard Raman spectrum of each hydrogen sulfide standard substance;
and fitting the characteristic Raman peak heights or areas corresponding to the hydrogen sulfide with different concentrations of the hydrogen sulfide to obtain the first relational expression.
In one possible design, the first relation is:
wherein the content of the first and second substances,
is the concentration of hydrogen sulfide;
is a first coefficient;
is sulfurCharacteristic raman peak height or area of hydrogen hydride;
is a first constant.
In one possible design, the second relationship between the concentration of the captured carbon dioxide, the characteristic raman peak height or area of the carbon dioxide, and the interference peak height or area of n-butane comprises:
obtaining a plurality of carbon dioxide standards with different carbon dioxide concentrations;
respectively detecting the standard Raman spectra of the carbon dioxide in the plurality of carbon dioxide standards by using the laser Raman analyzer;
determining the characteristic Raman peak heights or areas corresponding to carbon dioxide with different concentrations according to the standard Raman spectrum of each carbon dioxide standard substance;
obtaining a plurality of n-butane standard substances with different n-butane concentrations;
respectively detecting the standard Raman spectra of n-butane in the n-butane standard substances by using the laser Raman analyzer;
determining the interference peak height or area of the n-butane to the carbon dioxide according to the standard Raman spectrums of the n-butane and the standard Raman spectrums of the carbon dioxide;
and fitting the corresponding Raman peak heights or areas of the carbon dioxide with different concentrations, the concentration of the carbon dioxide and the interference peak height or area of the normal butane to the carbon dioxide to obtain the second relational expression.
In one possible design, the second relation is:
wherein the content of the first and second substances,
is the concentration of carbon dioxide;
is a second coefficient;
is the characteristic raman peak height or area of carbon dioxide;
is the third coefficient;
the interference peak height or area of n-butane; h is a second constant;
is a third constant.
In another aspect, an embodiment of the present invention provides an online hydrogen sulfide and carbon dioxide analysis device, where the device includes: the device comprises a natural gas feed gas output part, a gas-liquid separator, a filter, a pressure stabilizer, a laser Raman analyzer and a waste gas treatment part which are sequentially communicated;
flow regulating valves are arranged on a pipeline between the natural gas raw material gas output piece and the gas-liquid separator, a pipeline between the gas-liquid separator and the filter, a pipeline between the filter and the pressure stabilizer, a pipeline between the pressure stabilizer and the laser Raman analyzer, and a pipeline between the laser Raman analyzer and the waste gas treatment piece;
the walls of the natural gas raw gas output part, the gas-liquid separator, the filter, the voltage stabilizer, the laser Raman analyzer, the waste gas treatment part, the flow regulating valve and the pipeline are all provided with anticorrosive coatings;
the laser Raman analyzer is used for detecting the concentration of hydrogen sulfide and the concentration of carbon dioxide in the target natural gas feed gas.
In a possible design, the natural gas raw gas output part, the gas-liquid separator, the filter, the voltage stabilizer, the laser raman analyzer and the waste gas treatment part are detachably connected through pipelines.
In a possible design, the natural gas raw gas output part, the gas-liquid separator, the filter, the voltage stabilizer, the laser raman analyzer and the waste gas treatment part are connected through pipeline threads or flanges.
In one possible design, the filter includes a plurality of sub-filters connected in series.
In one possible design, the exhaust gas treatment element is a flare-out fire cabinet.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the on-line analysis device for hydrogen sulfide and carbon dioxide, provided by the embodiment of the invention, the gas-liquid separator is used for carrying out gas-liquid separation treatment on the target natural gas raw material gas, the filter is used for filtering the target natural gas raw material gas, the voltage stabilizer is used for carrying out voltage stabilization treatment on the target natural gas raw material gas, and the laser Raman analyzer can be used for simultaneously and highly accurately detecting the concentration of hydrogen sulfide and the concentration of carbon dioxide in the target natural gas raw material gas, so that the demand of timely adjustment of a process for purifying and desulfurizing carbon can be.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for on-line analysis of hydrogen sulfide and carbon dioxide provided by an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an on-line hydrogen sulfide and carbon dioxide analysis device provided in an embodiment of the present invention;
FIG. 3 is a graph showing the relationship between the hydrogen sulfide concentration and the characteristic peak intensity in example 1;
FIG. 4 is a graph showing the relationship between the concentration of carbon dioxide and the intensity of a characteristic peak in example 1;
FIG. 5 is a graph showing the relationship between the intensity of the interference peak of carbon dioxide and the intensity of the characteristic peak of n-butane in example 1.
Wherein the reference numerals denote:
1-a natural gas raw material gas output member,
2-a gas-liquid separator, wherein,
3-a filter, namely a filter,
4-a voltage stabilizer is arranged on the power supply,
5-a laser Raman analyzer, wherein the laser Raman analyzer is used for analyzing the Raman signal,
6-a waste gas treatment member, wherein,
7-flow regulating valve.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
The raman spectrum is a scattering spectrum, different substances correspond to different scattering spectra, and the heights or areas of raman peaks corresponding to substances with different contents are different, so that qualitative analysis and quantitative analysis can be performed on the substances through the raman spectrum.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In one aspect, an embodiment of the present invention provides an online analysis method for hydrogen sulfide and carbon dioxide, as shown in fig. 1, the method includes:
and step 101, outputting the target natural gas raw material gas by using the natural gas raw material gas output member 1.
Wherein, natural gas feed gas output member 1 can be for having the natural gas feed gas storage tank of flow control valve 7 to conveniently export the natural gas feed gas in the natural gas feed gas storage tank.
And step 102, performing gas-liquid separation treatment on the target natural gas feed gas by adopting a gas-liquid separator 2.
And the gas-liquid separator 2 is adopted to carry out gas-liquid separation treatment on the target natural gas raw material gas so as to prevent the target natural gas raw material gas from carrying moisture to corrode equipment and pipelines.
And 103, filtering the target natural gas raw material gas subjected to gas-liquid separation by using a filter 3.
The filter 3 can perform multi-stage filtration treatment on the target natural gas raw gas so as to completely filter and remove solid particle impurities in the target natural gas raw gas.
For example, filter 3 may comprise a multi-stage sub-filter to enable complete filtration of particulates greater than 0.1 microns from a target natural gas feed gas.
And step 104, performing pressure stabilization treatment on the filtered target natural gas feed gas by using a pressure stabilizer 4.
The pressure stabilizer 4 can adjust the flow and the pressure of the target natural gas feed gas, so that the target natural gas feed gas stably enters the laser Raman analyzer 5, and the laser Raman analyzer 5 is facilitated to analyze the target natural gas feed gas.
For example, the pressure stabilizer 4 can adjust the pressure of the target natural gas feed gas to 0.1-0.5MPa and the flow rate to ≦ 0.003MPa/cm2。
Optionally, step 105 includes, but is not limited to, the following sub-steps:
step 1051, obtaining a plurality of hydrogen sulfide standards with different hydrogen sulfide concentrations.
Wherein the hydrogen sulfide standard comprises hydrogen sulfide and nitrogen. The mole fraction of hydrogen sulfide may be 0.1% to 10%, for example, may be 0.1%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, etc.
Step 1052, respectively detecting the standard raman spectra of the hydrogen sulfide in the plurality of hydrogen sulfide standards by using a laser raman analyzer 5.
Before acquiring the standard raman spectrum of hydrogen sulfide, the pressure of the laser raman analyzer 5 needs to be adjusted to a reference constant pressure, the temperature of the laser raman analyzer 5 is set to 25 ℃, and the temperature is stabilized for 10 min. The baseline of the laser raman analyzer 5 was then determined using pure argon gas.
Note that the baseline was calibrated with pure argon at intervals (7 days or longer) and the water discharged from the gas-liquid separator 2.
And 1053, determining the characteristic Raman peak heights or areas corresponding to the hydrogen sulfide with different concentrations according to the standard Raman spectrum of each hydrogen sulfide standard substance.
And 1054, fitting the characteristic Raman peak heights or areas corresponding to the hydrogen sulfide with different concentrations of the hydrogen sulfide to obtain a first relational expression.
Wherein the first relational expression is:
wherein the content of the first and second substances,
is the concentration of hydrogen sulfide;
is a first coefficient;
is the characteristic raman peak height or area of hydrogen sulfide;
is a first constant.
And 106, acquiring a second relational expression among the concentration of the carbon dioxide, the characteristic Raman peak height or area of the carbon dioxide and the interference peak height or area of the n-butane.
Optionally, step 106 includes, but is not limited to, the following sub-steps:
step 1061, obtaining a plurality of carbon dioxide standards with different carbon dioxide concentrations.
Wherein the carbon dioxide standard comprises carbon dioxide and nitrogen. The mole fraction of carbon dioxide can be 0.01% to 11%, for example can be 0.01%, 0.05%, 0.1%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 11%, and the like.
And 1062, respectively detecting the standard Raman spectrums of the carbon dioxide in the plurality of carbon dioxide standards by using a laser Raman analyzer 5.
And 1063, determining the characteristic Raman peak heights or areas corresponding to the carbon dioxide with different concentrations according to the standard Raman spectrum of each carbon dioxide standard substance.
Step 1064, obtaining a plurality of n-butane standards with different n-butane concentrations.
The n-butane standard includes n-butane and nitrogen, among others. The mole fraction of n-butane can be 0.01% to 6%, and can be, for example, 0.01%, 0.05%, 0.1%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, and the like.
And 1065, respectively detecting the standard Raman spectra of the n-butane in the n-butane standard substances by using a laser Raman analyzer 5.
And step 1066, determining the interference peak height or area of the n-butane to the carbon dioxide according to the standard Raman spectrums of the n-butanes and the standard Raman spectrums of the carbon dioxide.
Specifically, the influence of the characteristic peak intensity of n-butane on the characteristic peak intensity of carbon dioxide is obtained by plotting the characteristic peak intensity of n-butane on the characteristic peak intensity of carbon dioxide.
And 1067, fitting the Raman peak heights or areas corresponding to the carbon dioxide with different concentrations, the concentration of the carbon dioxide and the interference peak height or area of the n-butane to the carbon dioxide to obtain a second relational expression.
Wherein the second relation is:
wherein the content of the first and second substances,
is the concentration of carbon dioxide;
is a second coefficient;
is the characteristic raman peak height or area of carbon dioxide;
is the third coefficient;
the interference peak height or area of n-butane; h is a second constant;
is a third constant.
Therefore, the influence of the n-butane in the natural gas feed gas on the carbon dioxide can be eliminated, and the content of the carbon dioxide in the natural gas feed gas can be detected with high precision.
And 107, detecting the actual Raman spectrum of the hydrogen sulfide, the actual Raman spectrum of the carbon dioxide and the actual Raman spectrum of the n-butane in the target natural gas feed gas after pressure stabilization by using a laser Raman analyzer 5.
And step 108, determining the concentration of the hydrogen sulfide in the target natural gas feed gas according to the first relation and the actual Raman spectrum of the hydrogen sulfide.
And step 109, determining the concentration of the carbon dioxide in the target natural gas feed gas according to the second relational expression, the actual Raman spectrum of the carbon dioxide and the actual Raman spectrum of the n-butane.
It can be understood that the concentrations of hydrogen sulfide and carbon dioxide in the target natural gas raw material gas are determined to be the concentrations of hydrogen sulfide and carbon dioxide in the target natural gas raw material gas after pressure stabilization treatment.
According to the on-line analysis method for hydrogen sulfide and carbon dioxide, provided by the embodiment of the invention, the target natural gas raw gas is subjected to gas-liquid separation through the gas-liquid separator 2, the target natural gas raw gas is filtered through the filter 3, and the target natural gas raw gas is subjected to pressure stabilization through the pressure stabilizer 4. Based on the second relational expression, the influence of n-butane on carbon dioxide can be eliminated, and the laser Raman analyzer 5 can simultaneously detect the concentration of hydrogen sulfide and the concentration of carbon dioxide in the target natural gas feed gas with high precision, so that the demand of timely adjustment of the process for purifying and desulfurizing carbon can be met.
In another aspect, an embodiment of the present invention provides an apparatus for online analysis of hydrogen sulfide and carbon dioxide, as shown in fig. 2, the apparatus includes: the device comprises a natural gas raw material gas output part 1, a gas-liquid separator 2, a filter 3, a pressure stabilizer 4, a laser Raman analyzer 5 and a waste gas treatment part 6 which are sequentially communicated through pipelines; flow regulating valves 7 are arranged on pipelines between the natural gas raw gas output part 1 and the gas-liquid separator 2, between the gas-liquid separator 2 and the filter 3, between the filter 3 and the voltage stabilizer 4, between the voltage stabilizer 4 and the laser Raman analyzer 5 and between the laser Raman analyzer 5 and the waste gas treatment part 6; the natural gas raw gas output part 1, the gas-liquid separator 2, the filter 3, the pressure stabilizer 4, the laser Raman analyzer 5, the waste gas treatment part 6, the flow regulating valve 7 and the pipeline have anti-corrosion performance; the laser Raman analyzer 5 is used for simultaneously detecting the concentration of hydrogen sulfide and the concentration of carbon dioxide in the target natural gas feed gas.
It should be noted that the laser raman analyzer 5 can detect hydrogen sulfide, carbon dioxide, and n-butane in the natural gas raw material gas, and the detection range is 0.1% -100% (concentration).
According to the on-line analysis device for hydrogen sulfide and carbon dioxide provided by the embodiment of the invention, the gas-liquid separator 2 is used for carrying out gas-liquid separation treatment on the target natural gas raw gas, the filter 3 is used for filtering the target natural gas raw gas, the voltage stabilizer 4 is used for carrying out voltage stabilization treatment on the target natural gas raw gas, and the laser Raman analyzer 5 can be used for detecting the concentration of hydrogen sulfide and the concentration of carbon dioxide in the target natural gas raw gas at the same time with high precision, so that the demand of timely adjustment of a process for purifying and desulfurizing carbon can be met.
As an example, the natural gas raw material gas output part 1, the gas-liquid separator 2, the filter 3, the pressure stabilizer 4, the laser Raman analyzer 5 and the waste gas treatment part 6 are detachably connected through pipelines.
Therefore, the detachable connection among the natural gas raw gas output piece 1, the gas-liquid separator 2, the filter 3, the voltage stabilizer 4, the laser Raman analyzer 5 and the waste gas treatment piece 6 is facilitated.
Specifically, the natural gas raw material gas output member 1, the gas-liquid separator 2, the filter 3, the laser raman analyzer 5, and the exhaust gas treatment member 6 may be connected by a screw thread or a flange. The mode of threaded connection and flange connection is easy to set up, makes things convenient for the dismouting.
As an example, the filter 3 includes a plurality of sub-filters connected in series.
And the multi-stage filtration through a plurality of sub-filters is beneficial to completely filtering and removing solid particles in the target natural gas feed gas.
The filter element in each sub-filter 3 may be a stainless steel filter element or a glass fiber filter element, so as not to be corroded by the corrosive gas.
As an example, the exhaust gas treatment member 6 is a flare-out chamber.
So, can burn the target natural gas feed gas after laser raman analysis appearance 5 analysis, avoid its polluted environment.
As an example, the laser raman analyzer 5 is installed in an air-conditioned positive pressure explosion-proof cabinet in which a hydrogen sulfide alarm is installed, and the temperature in the cabinet may be 25 ℃.
As an example, the corrosion-resistant material of all the components may be the sulfur corrosion-resistant material 316L, or may be other materials capable of preventing corrosion by hydrogen sulfide.
The invention will be further described below by means of some examples.
Example 1
In this embodiment, the content of hydrogen sulfide and carbon dioxide in the target natural gas feed gas is detected by using the online analysis method for hydrogen sulfide and carbon dioxide provided by the embodiment of the present invention, and the specific detection steps are as follows:
before analysis, the pressure of a laser Raman analyzer is adjusted to 0.1MPa, the temperature is 25 ℃, after the stability is carried out for 10min, a plurality of hydrogen sulfide standard substances with different hydrogen sulfide mole fractions produced by natural gas research institute of oil and gas field division, southwest of China oil are detected by the laser Raman analyzer, and specific parameters are detailed in the following table 1.
TABLE 1
The raman peak height, i.e., the number of photons, is larger as the raman peak height is larger, the number of corresponding photons is larger.
The mole fraction of hydrogen sulfide was plotted against its characteristic peak intensity to provide FIG. 3, which further identifies the first relationship as follows:
a laser Raman analyzer is adopted to detect a plurality of carbon dioxide standards with different mole fractions of carbon dioxide produced by natural gas research institute of oil and gas field division in southwest of China, and specific parameters are detailed in the following table 2.
TABLE 2
Plotting the mole fraction of carbon dioxide against its characteristic peak intensity to obtain FIG. 4, and further determining a second coefficient
Third constant number
A laser Raman analyzer is adopted to detect a plurality of normal butane standard substances with different normal butane mole fractions, which are produced by natural gas research institute of oil and gas field division in southwest of China Petroleum, and the specific parameters are detailed in the following table 3.
TABLE 3
Plotting the characteristic peak intensity of n-butane versus the characteristic peak intensity of carbon dioxide to obtain figure 5, and further determining a third coefficient
The second constant h is 7.1704.
The second relationship is then determined as follows:
outputting the target natural gas raw gas to a gas-liquid separator through a natural gas raw gas output part, performing gas-liquid separation treatment, enabling the target natural gas raw gas to enter a filter, performing filtering treatment through the filter, enabling the target natural gas raw gas to enter a voltage stabilizer, performing voltage stabilization treatment through the voltage stabilizer, and enabling the target natural gas raw gas to enter a laser Raman analyzer for analysis.
The characteristic Raman peak intensities of hydrogen sulfide, carbon dioxide and n-butane obtained by analyzing the target natural gas raw material by a laser Raman analyzer are 3502.6, 3782.3 and 46.6 respectively. After substituting into the first relational expression and the second relational expression, the molar fraction of hydrogen sulfide was 6.31%, and the molar fraction of carbon dioxide was 3.75%.
In summary, the device and the method for analyzing hydrogen sulfide and carbon dioxide on line provided by the embodiments of the present invention can simultaneously detect the concentrations of hydrogen sulfide and carbon dioxide in the natural gas feed gas, and further can meet the demand of timely adjustment of the process for purifying desulfurized carbon.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for on-line analysis of hydrogen sulfide and carbon dioxide, the method comprising:
outputting the target natural gas raw material gas by using a natural gas raw material gas output member (1);
carrying out gas-liquid separation treatment on the target natural gas feed gas by adopting a gas-liquid separator (2);
filtering the target natural gas raw material gas subjected to the gas-liquid separation treatment by using a filter (3);
performing pressure stabilization treatment on the filtered target natural gas feed gas by using a pressure stabilizer (4);
obtaining a first relational expression between the concentration of the hydrogen sulfide and the characteristic Raman peak height or area of the hydrogen sulfide;
acquiring a second relational expression among the concentration of the carbon dioxide, the characteristic Raman peak height or area of the carbon dioxide and the interference peak height or area of the n-butane;
detecting the actual Raman spectrum of hydrogen sulfide, the actual Raman spectrum of carbon dioxide and the actual Raman spectrum of n-butane in the target natural gas feed gas after the pressure stabilization treatment by using a laser Raman analyzer (5);
determining the concentration of the hydrogen sulfide in the target natural gas feed gas according to the first relation and the actual Raman spectrum of the hydrogen sulfide;
and determining the concentration of the carbon dioxide in the target natural gas feed gas according to the second relation, the actual Raman spectrum of the carbon dioxide and the actual Raman spectrum of the n-butane.
2. The method of claim 1, wherein obtaining a first relationship between the concentration of hydrogen sulfide and a characteristic raman peak height or area of hydrogen sulfide comprises:
obtaining a plurality of hydrogen sulfide standard substances with different hydrogen sulfide concentrations;
respectively detecting the standard Raman spectra of the hydrogen sulfide in the plurality of hydrogen sulfide standard substances by using the laser Raman analyzer (5);
determining the characteristic Raman peak heights or areas corresponding to hydrogen sulfide with different concentrations according to the standard Raman spectrum of each hydrogen sulfide standard substance;
and fitting the characteristic Raman peak heights or areas corresponding to the hydrogen sulfide with different concentrations of the hydrogen sulfide to obtain the first relational expression.
3. The method of claim 2, wherein the first relationship is:
wherein the content of the first and second substances,
is the concentration of hydrogen sulfide;
is a first coefficient;
is the characteristic raman peak height or area of hydrogen sulfide;
is a first constant.
4. The method of claim 1, wherein obtaining a second relationship between the concentration of carbon dioxide, the characteristic raman peak height or area of carbon dioxide, and the interference peak height or area of n-butane comprises:
obtaining a plurality of carbon dioxide standards with different carbon dioxide concentrations;
respectively detecting the standard Raman spectra of the carbon dioxide in the plurality of carbon dioxide standards by using the laser Raman analyzer (5);
determining the characteristic Raman peak heights or areas corresponding to carbon dioxide with different concentrations according to the standard Raman spectrum of each carbon dioxide standard substance;
obtaining a plurality of n-butane standard substances with different n-butane concentrations;
respectively detecting the standard Raman spectra of n-butane in the n-butane standard substances by using the laser Raman analyzer (5);
determining the interference peak height or area of the n-butane to the carbon dioxide according to the standard Raman spectrums of the n-butane and the standard Raman spectrums of the carbon dioxide;
and fitting the corresponding Raman peak heights or areas of the carbon dioxide with different concentrations, the concentration of the carbon dioxide and the interference peak height or area of the normal butane to the carbon dioxide to obtain the second relational expression.
5. The method of claim 4, wherein the second relationship is:
wherein the content of the first and second substances,
is the concentration of carbon dioxide;
is a second coefficient;
is the characteristic raman peak height or area of carbon dioxide;
is the third coefficient;
the interference peak height or area of n-butane; h is a second constant;
is a third constant.
6. An on-line hydrogen sulfide and carbon dioxide analysis device, comprising: the device comprises a natural gas raw material gas output part (1), a gas-liquid separator (2), a filter (3), a pressure stabilizer (4), a laser Raman analyzer (5) and a waste gas treatment part (6) which are sequentially communicated through pipelines;
flow regulating valves (7) are arranged on a pipeline between the natural gas raw material gas output part (1) and the gas-liquid separator (2), a pipeline between the gas-liquid separator (2) and the filter (3), a pipeline between the filter (3) and the pressure stabilizer (4), a pipeline between the pressure stabilizer (4) and the laser Raman analyzer (5) and a pipeline between the laser Raman analyzer (5) and the waste gas treatment part (6);
the natural gas raw material gas output part (1), the gas-liquid separator (2), the filter (3), the pressure stabilizer (4), the laser Raman analyzer (5), the waste gas treatment part (6), the flow regulating valve (7) and a pipeline have anti-corrosion performance;
the laser Raman analyzer (5) is used for simultaneously detecting the concentration of hydrogen sulfide and the concentration of carbon dioxide in the target natural gas feed gas.
7. The device according to claim 6, wherein the natural gas feed gas output member (1), the gas-liquid separator (2), the filter (3), the pressure stabilizer (4), the laser Raman analyzer (5) and the waste gas treatment member (6) are detachably connected through pipelines.
8. The device according to claim 7, characterized in that the natural gas feed gas output member (1), the gas-liquid separator (2), the filter (3), the pressure stabilizer (4), the laser Raman analyzer (5) and the waste gas treatment member (6) are connected through pipeline threads or flanges.
9. The device according to claim 6, characterized in that the filter (3) comprises a plurality of sub-filters connected in series.
10. An arrangement according to any one of claims 6-9, characterized in that the exhaust gas treatment member (6) is an emptying fire box.
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